I am completely lost after we create a variable that stores correctGuess = false; Any help would be appreciated

Okay, in the video Dave has us create a variable called correctGuess = false because, when we first start the game we have not guessed anything. Now under the do loop we add correctGuess = true; My first question is, is the reason we put correctGuess = true; in the do loop so that if the user guesses the correct value the program will stop and go to while loop? Next we add ! correctGuess to the while loop which means not true but, because we are using a while loop that actually changes to "is true" and if the user guesses the right answer the two document.write functions "fire."

I could be way off on this because, I'm kind of lost. If someone could correct me and explain this to me I would really, really, really appreciate it. I'm rather new to JavaScript so if you could really break down what's going on here in plain English would also help me a lot. Thank in advance for any help.